leetcode-problemset/leetcode-cn/originData/find-valid-pair-of-adjacent-digits-in-string.json

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        "question": {
            "questionId": "3736",
            "questionFrontendId": "3438",
            "categoryTitle": "Algorithms",
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            "title": "Find Valid Pair of Adjacent Digits in String",
            "titleSlug": "find-valid-pair-of-adjacent-digits-in-string",
            "content": "<p>You are given a string <code>s</code> consisting only of digits. A <strong>valid pair</strong> is defined as two <strong>adjacent</strong> digits in <code>s</code> such that:</p>\n\n<ul>\n\t<li>The first digit is <strong>not equal</strong> to the second.</li>\n\t<li>Each digit in the pair appears in <code>s</code> <strong>exactly</strong> as many times as its numeric value.</li>\n</ul>\n\n<p>Return the first <strong>valid pair</strong> found in the string <code>s</code> when traversing from left to right. If no valid pair exists, return an empty string.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;2523533&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">&quot;23&quot;</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>Digit <code>&#39;2&#39;</code> appears 2 times and digit <code>&#39;3&#39;</code> appears 3 times. Each digit in the pair <code>&quot;23&quot;</code> appears in <code>s</code> exactly as many times as its numeric value. Hence, the output is <code>&quot;23&quot;</code>.</p>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;221&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">&quot;21&quot;</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>Digit <code>&#39;2&#39;</code> appears 2 times and digit <code>&#39;1&#39;</code> appears 1 time. Hence, the output is <code>&quot;21&quot;</code>.</p>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">s = &quot;22&quot;</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">&quot;&quot;</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>There are no valid adjacent pairs.</p>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>2 &lt;= s.length &lt;= 100</code></li>\n\t<li><code>s</code> only consists of digits from <code>&#39;1&#39;</code> to <code>&#39;9&#39;</code>.</li>\n</ul>\n",
            "translatedTitle": "找到字符串中合法的相邻数字",
            "translatedContent": "<p>给你一个只包含数字的字符串&nbsp;<code>s</code>&nbsp;。如果 <code>s</code>&nbsp;中两个 <strong>相邻</strong>&nbsp;的数字满足以下条件，我们称它们是 <strong>合法的</strong>&nbsp;：</p>\n\n<ul>\n\t<li>前面的数字 <strong>不等于</strong> 第二个数字。</li>\n\t<li>两个数字在 <code>s</code>&nbsp;中出现的次数 <strong>恰好</strong>&nbsp;分别等于这个数字本身。</li>\n</ul>\n\n<p>请你从左到右遍历字符串 <code>s</code>&nbsp;，并返回最先找到的 <strong>合法</strong>&nbsp;相邻数字。如果这样的相邻数字不存在，请你返回一个空字符串。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<div class=\"example-block\">\n<p><span class=\"example-io\"><b>输入：</b>s = \"2523533\"</span></p>\n\n<p><span class=\"example-io\"><b>输出：</b>\"23\"</span></p>\n\n<p><strong>解释：</strong></p>\n\n<p>数字&nbsp;<code>'2'</code>&nbsp;出现 2 次，数字&nbsp;<code>'3'</code>&nbsp;出现 3 次。<code>\"23\"</code>&nbsp;中每个数字在 <code>s</code>&nbsp;中出现的次数都恰好分别等于数字本身。所以输出&nbsp;<code>\"23\"</code>&nbsp;。</p>\n</div>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<div class=\"example-block\">\n<p><span class=\"example-io\"><b>输入：</b>s = \"221\"</span></p>\n\n<p><span class=\"example-io\"><b>输出：</b>\"21\"</span></p>\n\n<p><strong>解释：</strong></p>\n\n<p>数字&nbsp;<code>'2'</code>&nbsp;出现 2 次，数字&nbsp;<code>'1'</code>&nbsp;出现 1 次。所以输出&nbsp;<code>\"21\"</code>&nbsp;。</p>\n</div>\n\n<p><strong class=\"example\">示例 3：</strong></p>\n\n<div class=\"example-block\">\n<p><span class=\"example-io\"><b>输入：</b>s = \"22\"</span></p>\n\n<p><span class=\"example-io\"><b>输出：</b>\"\"</span></p>\n\n<p><strong>解释：</strong></p>\n\n<p>没有合法的相邻数字。</p>\n</div>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>2 &lt;= s.length &lt;= 100</code></li>\n\t<li><code>s</code>&nbsp;只包含&nbsp;<code>'1'</code> 到&nbsp;<code>'9'</code> 的数字。</li>\n</ul>\n",
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